Reciprocating scraping machine



Nov. 2, 1937. K. SUZUKI RECIPROCATING SCRAPING MACHINE Filed Aug. 19, 1936 Patented Nov. 2, i937 burrs!) sreres RECIPROCATING SCRAPING MACHINE Kyo Suzuki, Hitachi-machi, Tagagnn, Ibarakiken, Japan, assignor to Nihon Kogyo Kabushiki Kaisha, Tokyo, Japan Application August 19, 1936, Serial No. 96,890 In Japan September 13, 1935 1 Claim.

This invention relates to improvements in a reciprocating scraping machine and has for its object to make the movement of the scraping vanes or claws longer and substantially straight in a forward or scraping direction, while raised .in a return direction. More specifically these objects are obtained with a very simple construction. That is to say, by means of a single crank and Without employing a cam or cams and their accessories a smooth and effective scraping operation is obtained.

In the accompanying drawing,

Fig. l is a longitudinal section along line II in Fig. 2, showing the reciprocating scraping machine according to this invention. Fig. 1A is a detailed View of the crank part. Fig. 2 is a plan view of the scraping machine. Fig. 3 is a diagram showing the circulating movement of vanes or claws. In the drawing the same symbols denote the same parts respectively.

In Fig. 1, T is a tank containing mud water, pulp in one dressing and the like. S is a frame for a scraper having a series of vanes or claws V. F represents a beam. P is a pulley and i indicates a driving shaft having the pulley and a crank 2 positioned at one end thereof. 2 is a crank arm carried by the crank 2. 4 is a bell crank which is journalled on a crank pin 3 carried by the crank arm 2. 5 is a pin provided on one end of the bell crank 4. 5 is a pin provided on the other end of the bell crank t. 1 is a fixed pin provided on a bracket F of one of the beams F, and 8 is a link one end of which is pivoted on the fixed pin "l and the other end on the pin 6. 9 and iii are arms rigidly attached to the frames of the scraper. ii is a link one end of which is pivotally connected to the pin 6 and the other end is pivotally connected to a pin i2. i4 is a fixed pin provided on a bracket F" of the other beam F. 83 is a link one end of which is pivotally connected to the fixed pin l4 and the other end to the pin I2. I5 is a link one end of which is pivoted to the pin l2 and the other end to a pin it carried by the arm 9. The arms 9 and iii are hinged by means of the pins 5 and Hi. The links 8 and iii are of equal length and the length of the link it is equal to the distance between the pins 7 and M. The links 8 and i3 are therefore arranged parallel to each other. Thus a quadrangle formed by the points 6, l, M and 12 provides a parallelogram. Likewise, the link l5 and an imaginary line connecting the pins 5 and 6 of the bell crank 4 are made equal in length and parallel to each other. Therefore an imaginary quadrangle formed by the points 5--t-I2i6 constitutes a parallelogram. The movement of the pin l6 thus corresponds to the motion of the pin 5. When the pulley P rotates in the direction of an arrow shown in Fig. 1, the circular motion of the crank pin 3 oscillates the pin 6 upon an arc having the pin 6 at its centre of osciilation and the link 8 as its radius. Thus the pin 5 moves on a locus at a constant distance from the pins 3 and 6, and a greater part of the path in the forward movement is a straight line, while that in the return movement is a curve. Fig. 3 is a diagram showing this locus and in which, when the crank pin 3 rotates in the order a, b, c, d, e, f, g, h, i, 7' and la, then the pin 5 also moves in the same order a, b, c, d, e, f, g, h, i, 7' and Is. As shown in the diagram, the locus traced by the pin 5 is substantially a straight line on its forward movement as shown in the part h, i, 7', k, a and b, while in its return movement the part b, c, d, e, 7, g, and h is a curve.

The motion of the pin 5 gives a similar movement at, b, c, d, e, f, g, h, i, :i and k to the pin it as diagrammatically shown to the left of Fig. 3. The frame S being pivotally hung by the pins 5 and It performs a substantially straight, long and quick forward movement when the frame is in a base position, while the frame is raised during the return movement. Thus the material in the tank T is moved to the right of Fig. 1 by the claws V during the forward motion of the frame S. During the backward movement of the frame S the claws V are lifted to escape the material. These movements are achieved simply by one crank motion through the bell crank and parallel motion mechanism without employing any cam or the like. Furthermore, a relatively large stroke can be obtained in spite of the fact that the length of the crank arm is comparatively small.. At the same time, very smooth driving can be continued at relatively high speed, as the mechanism is constituted by a mere combination of arms and pins.

What I claim is:-

In a scraping machine, a frame, a series of claws carried by said frame, a pin for supporting said frame at each end thereof, means for bodily moving and supporting one of said pins comprising a bell crank having one end thereof connected to one of said pins, rotatable means supporting the central portion of said crank, a swingable link connected to the other end of said crank, means for supporting the other of said pins comprising a fixed support, a link pivoted thereto of a length equal to said first mentioned link, a third link pivoted to the swingable end of able links, and means for rotating the central portion of said bell crank whereby both of said frame supporting pins are moved in similar paths to bodily move said frame in one direction in a straight plane and in a raised curved path during 5 the reversal thereof.

KYO SUZUKI. 

